Electbic-iamp-socket cap



A. W. LIMONT.

ELECTRIC LAMP SOCKET CAP.

APPLICATION FILED MAR. 3,1919.

1 ,325,875. Patented Dec. 23, 1919.

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ALEXER W. LIMONT, OF BBIDGEPOR'I, CONNECTICUT.

ELECTRIC-LAMP-SOGKET CAP.

naaaeaa specification of Letters Patent.

Patented Dec. 23, i919.

Application filed March 3, 1919. Serial No. 230,275.

To all 'wkom it may concern:

Be it known that l, ALEXANDER-W. LrMoN'r, a citizen of the United States, and resident of Bridgeport, in the county of Fairfield and State of Connecticut,'have invented certain new and useful Improvements in Electric-Lamp-Socket Caps, of which the following in a specification.

This invention relates to new and useful improvements in incandescent electric lamp sockets and more especially to the construction of the cap thereof.

The invention has particular reference to a style of cap having a number of engaging openings in. its skirt portion, to receive correspondmg latching elements of the shell, and which also includes an outer closing member for covering said openings as is more particularly shown in several prior patents, as for instance Patent #967,356.

The objects of'the invention are to simplify, cheapen and generally improve .the construction of caps of this general character and to design the same so that they can be made of a single piece of sheet metal, by a series of operations and which when so produced will have substantially the same appearance, and operate in the same manner as the cap shown in the patents referred to; to further design the cap so that it may be manufactured in an improved manner which will materially strengthen the cap,

whereby the objectionable raw edges formed upon the lower rim oh? the flange, when emp oying an attached ring, will be eliminated.

A further feature of the invention is to form a closed bead around the top of the neck of the cap and to provide a rolled thread inside the neck whereby the cap may be screwed and fastened to a pipe or fitting thereby eliminating the use of an attached nipple such as has heretofore been commonly employed; also to form corrugations upon the outside of the neck in a manner to strengthen and stifi'en' the same.

With these and other objects in view the invention resides and consists in the construction and novel combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without departure from-the spirit or sac- .forcovering t lnand down to f rm the outer of the flange.

rificing any of the advantages .of the invention.

Similar characters of reference denote like or corresponding parts throughout the several figures of the accompanying drawings formlng a part of this specification, and upon which,

Figure 1 shows a perspective view of my improved cap together with a shell to which it may be attached.

Fig. 2 is a top plan view of the cap blank in process of manufacture and showmg the general outline ofthe dome, skirt and neck portions of the cap.

Fig. 3 shows' a central vertical cross section of thecap blank as shown in Fig. 2.

Flg. 4 is a central vertical cross section illustrating the shape the blank assumes after the next step in my process of manufacture is performed.

' Fig. 5 shows a further section illustrat ing the result of the further operation, of disposing the flange farther, up to form the skirt, and

Fig. 6 illustrates a central vertical cross section throu h the finished cap, "the brim e skirt portion being closed Referring in detail to the characters of reference marked upon the drawings, A indicates the cap as a wholeand B the shell, each of which when formed in accordance w1th my present invention are made of a single piece of sheet metaL- The constructlon of the. shell,- however, may be varied so far as the application of my improved form of cap is concerned, since the cap is equally well adapted to be used upon several well known commercial types of shells thatare sleeved into the flange of the cap and having specially shaped upper engagingedges. 'The shell shown includes a corrugated upper" edge and is provided with interlocking elements 7 arranged opposite to each other and one of which is arranged adjacent to the slot 8 which may accommodate the key for operating the. switch.

A finished cap constructed in accordance with the invention is shownin Figs. 1 and 6 while the other intermediate figures illustrate the several operations employed in the manufacturing of the cap. it would first direct attention to Figs. 2 and 3 which show the sheet metal blank from which the cap is made, and wherein 9 represents the dome closed wall portion of the cap, .10 the neck whose top edge portion 11 is first flared out as shown in Figs. 2 and 3. The lower edge portion is disposed out at a right angle to form a straight annular brim 12. 'An annular in-.

clined shoulder 13 is formed at the base of the dome of the shell and the cylindrical skirt portion is provided with corrugations 14 and perforations 22 to receive the interlocking element 7 of the shell B.

The brim 12 as shown in Figs-2 and 3 is bent up to form an outer inclosing portion 15 of the flange, the wall of which is disposed vertically and spaced from the skirt portion in a manner to form a pocket 16 therebetween. With the provision of the pocket 16 between the skirt and the inclosing portion, the skirt is rendered resilient and suflicient space is provided for a slight expansive movement of the skirt in positionin the .cap upon a shell. The edge portion 1 of this brim is finally turnedin against the lower portion of the peripheral surface .of the dome and into the annular inclined shoulder 13 in a way to hold the said edge portion in position. This formation of the metal is preferably done by-several operations as indicated y the-several drawings, The first'operation is that of disposing thebrim up at an angle of about degrees as shown in Fi 4 and with its edge portion 17 bent in sl ghtly farther. The next operation as indicated in Fig. 5 serves to carry' the stock up straight and' parallel tojthe inner skirt leaving the deflected edge portion '17 disposed inward. The final operation ofthis portion of-the blank is that of turning the edge 17 down upon the shoulder 13 in the. manner previously suggested.

If for v any reason this edge of the brim I shouldbe left ragged or ununiform in width when. disposed in its upward direction as shown in Fig. 5 it may be trimmed to a'uniform width so as to fit snugly into the shoulder: against the 'dome.

produces the completed fiange of two thickthe skirt portion of the ca leaving a per- 5O .nes'ses of metal formed integral one with the other, the outer member serving to inclose fectly smooth finish upon al exposed'parts and especially upon its lower edge-or rim. The severe setting and abrupt bending of the stock around the lower edge of the cap as indicated by 18 serves to harden and stiffen the metal at that point and thereby materially strengthens the lower rim of the finished product.

The neck portion like the rest of the cap is formed of one and the same thickness of metal and is rolled as shown to form the internal thread 19 and the outer rib portion 20 and has its upper edge portion rolled to form a head 21 as indicated. This head as This construction well as the ribs formed upon the periphery serves to materially strengthen the neck of the cap while the internal threads serve the usual purpose of attaching the socket to a threaded pipe.

Having thus described my invention, what I claim and desire to secure by Letters Patent,.is:

1. An. electric lamp socket cap, comprising a neck portion, a dome, a skirt having perforations therein, and an outer inclosing portion formed integral with the skirt and disposed upward from the lower part thereof to inclose the perforations and being slightly spaced from the skirt to permitexpansion thereof.

2. An electric lamp socketcap, comprising in part a dome, a perforated skirt, an annular shoulder'above the corrugations and having an inclined top surface, an outer inclosing portion for covering the perforations, having an upper edge portion that is turned in upon the inclined top surface of theshoulder with the main body portion ing in part a dome, an annular shoulder at the base of the dome, a skirt below the shoulder, an outer inclosing portion formed integral with the skirt and disposed upward to cover the same and having its upper portion disposed in u on the shoulder and against the dome wlth the main body portion thereof spaced from the skirt to permit expansion of the skirt.

4;. An electric lamp socket' cap, formed of one, piece of metal, comprising a neck formed of one thickness of metal and having a rolled thread upon its inside, a dome, an annular shoulder, a skirt, and an integral outer covering for the skirt whose upward disposed edge portion is turned in upon the shoulder with the main body portion thereof spaced from-the skirt to permit expansion of the skirt.

5. An electric lamp 'socket cap formed of one piece of metal, comprising a neck formed of one thickness of metal and having integral attaching means, a dome, and a flange for covering a socket shell, said flange being formed of spaced inner and outer thicknesses of metal bent back around its lower edge and having the upper edge of the outer covering disposed in and against the dome.

Si ed at Bridgeport in the county of Fair eld and State'of Connecticut this 28th day of February, A. D., 1919.

- -'ALEXANDER W. LIMONT.

Witnesses:

' G. M. NEWMAN,

LILLIAN M. ALLING. 

